﻿// Copyright 2004-2011 Castle Project - http://www.castleproject.org/
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//     http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

namespace Castle.MonoRail.Framework.Internal
{
	using System;
	using Descriptors;

	static class RescueUtils
	{
		public static RescueDescriptor SelectBest(RescueDescriptor[] rescues, Type exceptionType)
		{
			RescueDescriptor bestCandidate = null;
			RescueDescriptor mostGenericCandidate = null;

			foreach(var rescue in rescues)
			{
				if (rescue.ExceptionType == exceptionType)
				{
					return rescue;
				}
				else if (rescue.ExceptionType != null)
				{
					if (rescue.ExceptionType == typeof(Exception))
					{
						mostGenericCandidate = rescue;
					}
					else if (rescue.ExceptionType.IsAssignableFrom(exceptionType))
					{
						bestCandidate = rescue;
					}
				}
			}

			return bestCandidate ?? mostGenericCandidate;
		}
	}
}